Light color screen



Nov. 8, 1927. 1,648,234

s. L. KELLERT LIGHT COLOR SCREEN Filed May 16. 1925 3 Sheets-Sheet 1 INVENTOR. iIIL'TRRLS L. KELLER! BY W A TTORNE Y.

Nov. 8, 1927. 1,648,234

- C. L. KELLERT r LIGHT COLOR SCREEN Filed y 16. 1925 3 Sheets-Sheet 3 INVENTOR. CHARLES L. KE LLER'T lbum A TTORNEY.

Nov. 8, 1927. 1,648,234

, c. L. KELLERT LIGHT COLOR SCREEN Filed May.16, 1925 3 Sheets-Sheet 3 FIG."

INVENTOR. CHARLES I... KELLER? BY z A TTORNEY.

Patented Nov. 8, 1927..

UNITED STATES CHARLES L. KELLERT. F BALTIMORE, MARYLAND.

LIGHT 001.01; SCREEN.

Application flledllay 1c, 1925. Serial No. 30,754.

My invention relates to lighting devices, and more particularly to such as are arranged to project difi'erent colored lights, whereby such variously colored lights may be displayed upon an object to be illuminated.

A primary object of my invention is to provide a device in which a'series of variously colored slides or plates may be brought successively before a central relatively stationary light source, all of which forms part of a. portable projecting apparatus.

A further object of ,my invention is to provide an improved automatic means for imparting a step-by-step movement to a re volving color screen, said automatic means being controlled by a thermostatic element which produces an intermittent vflow of current. a

A still further object of my invention is to provide an improved casing or housing for the light projecting element which is itself adapted to carry the moving parts of the actuating mechanism for the revolving screen, said casing being extremely simple in construction and light in weight.

A still further object of my invention is to provide an improved mounting for therevolving color screen rot-hat said screen may be readily removed or replaced without requiring any disassembly of the projection apparatus per se. v

A still further object of my invention is the provision of an improved mounting for the apparatus such that free and easy access to the interior of the housing may be had at all times.

Still further objects are the provision of improved and efficient means for mounting the thermostatic control element, for relatively adjusting the position of the light source with respect to the projection apparatus lens, and for inserting and maintaining the various colored screens in place in the revolving screen.

Other objects of my invention will appear more fully hereinafter,

The invention consists substantially in the construction, combination, location and relative arrangement of parts. all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a ride elevation of one preferred embodiment otnmy invention.

Fig. 2 is a sectional view taken substantially on line 2+2 of Fig. 1. I

Fig. 3 is aside elevation taken substan-' tially on line 33 of Fig. 2 which is similar to that of Fig. 1 except that the color screen has been removed. v

Fig. 4 is a side elevation opposite to that of Fig. 3 and taken substantially on line 44 of Fig; 2.

Fig. 5 is a sectional view taken substantially on line 5-5 ofFig. 1.

Fig. 6 is a sectional view taken substantially on line 6-6 of Fig. 1.

Fig. 7 is a sectional view taken substantially on line 77 of Fig. 2.

Fig. 8 is a detail view showing the focusing arrangement and is taken substantially on line 88 of Fig. 4.

Fig. 9 is a view taken substantially on line 99 of Fig. 4. I

1 Pi s. 10 and 11 are diagrammatic views showing the various electrical connections to the apparatus.

Fig. 12 is a view with the color screen and actuating mechanism removed, showin a modified form of my invention, the mo ification being shown in dotted lines.

In the drawings similar reference numerals indicate like parts wherever the occur.

In general, my invention contemp ates the provision of a portable lamp housing made up of two main parts complemental to one another and suitably joined together. The light is supplied from a lamp positioned within the housing to which full current is supplied at all times... A rotatable color screen is suitably mounted on the lamp housing in such manner that upon its rotation a series of variably colored slides or plates pass successively in front of the house mg lens. The actuating means for this color- PATENT OFFICE.

the colonscreen actuating mechanism and the thermostatic control are adapted to be carried by the lamp housing so that its port ability is in no way affected. 'Where a sing e unit is to be used the electrical circuits are so arranged that while the same source of power is employed for both the lamp and the thermostatic control element, yet the burning out of the lamp or the failure of each unitand to substitute in its stead an ordinary plug socket and a suitably insulated binding post is provided in the casingproperfor commonly receiving the leads from the electromagnet, as will be more fully described hereinafter. -Where such a battery of units is employed, a single thermostatic element is placed at some suitable convenient point, preferably in the vicinity of the power allel.

supply source, and this thermostat controls a master relay, for simultaneously energizing and de-energizing the several electromagnets which are conneced thereto in par- This arrangement provides .for a simultaneous operation of the several color screens, as will be described in greater detail hereinafter.

In the accompanying drawings I have shown a construction embod ing my invenion and the method I emplby in carrying the same into practical o eration, the construction shown, while t e best form in which I contemplate at present in carrying out .my invention, being merely illustrative of the principles involved, as many variations in the details of structure and arrangement may occur 'to persons skilled in the art and still fall within the broad scope of my invention as defined in the claims. Referring specifically to the drawings, and more particularly to Figures 1, 2 and 3 the lamp is suitably supported within a casing 11. This casing 11 is made of two main sections 12 and 13 which are suitably joined together by screws or other means-as shown at 14. Preferably, the.section 12 is an aluminum casting of substantially U-shaped cross-section provided with side walls 15 and 16 and a base wall 17. The front, top and rear edges of these sides are rabbeted to provide seats or shoulders 18 to which are secured the marginal edges of the section 13 and which extends from the rear edge of the base Wall 17 to the front edge thereof to constitute in effect a closed casing. An opening 19 is provided in a portion of the section 13 forming the front wall of the casing, said opening being covered by a lens 20 through which pass the rays of light from the lamp 10.

The wall 15 of the casing is provided with an inset chamber 21, preferably formed integrally therewith. Formed in the base wall of this chamber 21 are studs or bosses 22, 23 and 24 for a purpose to be more fully explained hereinafter. The opposite wall 16 of the lamp casing is provided with an opening 25 for providing access to the interior of the casing. A door 26iis preferably mounted upon 'one edge of the opening by means of hinges 27 (see F igi. 4). The

basewall 17 of the casingll is preferably provided with an opening 28 below which is suitably disposed a box-like. member 29.

1 preferably mount the lamp socket 32 within the casing 11 to provide for adjustment toward and from the lens. Guide rods or bars 33 and 34 having their ends bent downwardly are secured to the bottom of the box 29 by nuts 35 and on these bars a support 36, upon which the socket 32 is mounted, is adapted to be slidably mounted. Links 36 and 37 pivotally connected together at 38 are the preferred means for imparting movement tothe lamp socket. The lower end of the link 37 is pivotally connected to the lamp socket 32 as at 39 while the upper end of the link 36 is fixed to a laterally extending rod 40 having its free end supported in the wall 16 of the lamp casing. -A knob 41 is preferably fixed to the exposed end of the rod whereby upon rotation thereof in either direction the lamp will be moved toward or away from the lens in a manner which will be readily understood. A spring 42 is preferably interposed between the knob 41 and the casing wall 16 which acts as a friction clutch to preclude unintended movement of the lamp socket.

A color screen 43 is arranged to encircle the lamp 10 and its casing 11 it being preferably mounted upon one of the casing Walls as will be presently described. The screen 43 comprises preferably a sheet metal stamping 44 (see Figure 9) bent into the shape of a ring and having inturned flanges 45 and 46 at the edges thereof to constitute in effect a pair of parallel side rings. This stamping is provided with a plurality of openings 47 equal in number to the number of slides or plates carried by the screen, these openings being separated from each other by the integral transverse sections 48. Slots 49 are provided in one edge of the screen 43 through which are adapted to be inserted a III) series of colored slides or plates 50 of isin-' and extending from the inner edge of ange 45 to the inner edge of flange 46. This is most clearly shown in Figs. 6 and-9. This bracing wire may be dispensed with, hoW- ever, where glass or similar slides are used. Brace rods 52 are arranged transversely of the parallel side rings at intervals about the peripheries thereof and extend through openings formed in the slotted edge of the screen 43 and beneath the transverse sections a 48. The far ends of the rods 52 are secured to the flanges 46 in any suitable manner, while the innerends thereof are formed integrally with radially extending spokes 53,

though, if desired, said brace rods may be.

secured to the outer ends of the spokes in any other suitable manner. The inner ends of the spokes 53 are preferably connected to a hub 54 which is revolvably mounted as will be more fully described hereinafter.

The means for imparting a rotary movement to the color screen about the lamp casing comprises an electromagnetica ly operated actuating mechanism, generally indicated at 55. and mounted within the chamber 21 in any desired manner. Threaded into the boss 23 formed in the base of the chamber 21 is a fixedlshaft 56 providing a laterally extending stationary bearing shaft upon which is adapted to be rotatably mounted the color screen hub 54. A laminated core 57 about which is mounted the magnet coil 58 is secured to the base wall of the chamber 21 by means of screws or bolts 59 threaded into the bosses 22 and 24. \Vhile in the preferred form the section 12 of the lamp casing is made of aluminum or other non-magnetic material. any other material may be employed. as desired. provided the ifnagnetic core 57 is suitably insulated thererom. Provided at the outer ends of the core 57 are a pair of pole pieces 6060 within which an armature 61 rotatably mounted upon a bearing 62 fixed to the shaft 56 is adapted to swing. A spring 63 normally maintains the armature 61 in engagement with a stop 64 suitably secured to the wall of the casing. The outer face of the armature 61 is provided with a recess 65 in which is arried a spring-pressed pawl 66 for engagement with a member as will be presently described. Upon energization of the magnet coil 56 the armature 61 is caused to rotate against the action of the spring 63 carrying the pawl 66 with it.

As has already been described the color screen 43 is secured to the hub 54. The latter is provided with an inwardly extending collar 67 to the inner end of which is fixed a ratchet wheel 68 provided with the same number of teeth 69 that the screen has colored slides. The hub-54 together withthe color screen 43 and the ratchet wheel 68 is mounted upon the bearing shaft 56 in such manner that the ratchet wheel 68 is received within the recess 65' in the armature whereby engagement is effected between the panel 66 and the ratchet teeth 69. Upon rotation of the armature, the pawl 66, through its engagement with the ratchet Wheel 68 advances the color screen an' amount sufficient to move the next color slide in front of the lens 20.

I have shown a preferred means for providing an intermittent movement of the color screen which consists of a thermostatic element for controlling the supply of current to the electromagnet. The thermostat, indicated generally by 70, is suitably mounted upon the casing 11 in detachable manner. Preferably a split clamping ring 71 is integrally formed on the forward portion of the casing wall 11 by means of which the thermostat is held in place.- The connections between thethermostatic control element 70 and the electromagnet coil 58 are most clearly shown in Fig. 10. By means of the plug 72 (see current is supplied to the lamp 10 and to the thermostat 70 in series with the coil 58. The intermit: tent current flow thus supplied-to the coil causes alternate energization and de-energization thereof with the consequence that upon energization the armature will rotate and so cause a rotation in turn of the color screen. Upon tie-energization of the coil the armature will be pulled back to normal position by the spring 63 thus causing the pawl 66 to engage with the next succeeding tooth 69 and so on. A plate 73 is fixedly mounted upon the hub collar 67 and has its periphery curved as is best shown in Fig. 1 with which is adapted to coact a spring 74 for effectually precluding any backward movement of the color screen.

A feature of this invention is that while the spot light projecting apparatus described carries as parts thereof all the actuating mechanisms for imparting rotative movement of the screen about the lamp casing, it is essentially a portable apparatus. In order to make this portability of maxi- -mum effectiveness the supporting bracket 75 is secured by welding or otherwise to the door 26 of the lamp casing. The bracket 75. which is arranged for universal adjustment of the casing in any desired position or angle, may be readily secured to any desirable support. By providing that the bracket be mounted to the door of the casing having l 70 is removed from t the leads 80 and 81 are joined together as at once fixed the to the source of sup ly.

lights may then be vention wherein I employ,

osition of the casing with respect to the o ject to be illuminated it becomes only necessa to unfasten the door catch 76 and swing t e casing away from the door which is held stationarily in position. Free access is then provided to the interior of the casing. Figure '11 shows the connections when a plurality of units are used. When such a battery of units is employed, the thermostat e clamp ring 71 and 82 (see Fig. 10, dotted connections). The point 82 is shown in Fig. 2 as being an 1nsulated binding post for this purpose. single thermostat is employed at the source of current supply to control the operation-of a master relay 8 3 which in turn controls simultaneously the supply-of current to the magnet coils 58 which are connected parallel Any desired arrangement of colore had.

I Figure 12 shows a modified form of my ininstead of a spot light, a flood light projecting apparatus. In this case the lens 20 is dispensed with, as are the box 29 and 38-41.. In place of the lens 20 is mounted a reflector 84 which is provided at its rear with an opening 85 for reception of a socket 86 for the lamp 87. As has been described in connection with the spot light projecting ap paratus, the color screen has imparted to it an intermittent rotary movement, the sole difierence being that in one case the color screen revolves about a spot light apparatus whereas in the other case it revolves about a flood light apparatus.

I ing variously I am aware that the embodiment shown here may be changed considerably without departing from the spirit of my invention, andtherefore, I claim my invention broadly, as indicated by the appended claims.

' .What I claim as new and useful is:

1. In a device of the character described,

the combination of a translucent screen havdispose said screen sections in 'the path of rays from a. light source, with a housing for said light source located within said screen, said hou. 'ng having a chamber formed integrally therewith for reception of said actu- 2. In a device of the class described, a source of light, a housing for said source of light, said housing being provided with an inset portion, a rotatably mounted screen adapted to revolve about said housing, an means for rotating said screen located ,within said inset portion.

3. In a device of the class described, a

'source of 1i ht, a housing for said source of light provi ed with a depression in one wall the adjusting mechanism colored sections, and means foractuating said screen whereby to successively d- .base wall of said thereof, a bearing element secured to said housing, a translucent screen having av plurality -of vari-colored sect-ions rotatably mounted on said bearing element, and means disposed within said depression and also rotatably mounted on said bearin element and adapted for imparting a stepy-step movement to said screen whereby said vari-col-v ored sections successively intercept the rays 4. In a 'device of the class described, a

a source of 1ight,said hous1ng-- from said light source.

housing for comprising a casting of substantially U- shaped cross-section having its front, rear A and top open, and a member conforming and 8 through which the ra s of light are projected, a rotatable co or screen supported on said casing exteriorly thereof, and means also mounted exteriorly of said housing but within the planes of the side walls'thereof for lmparting an intermittent rotation to saidscreen. I i

6. In a device of the class described, in combination, a source of light, a casing for said source of light, a chamber formed in one side of said casing and presenting the open side thereof "outwa1'dly, an electromagnot carried within said chamber. an armaturefor said electromagnenand means on said armature adapted to impart an intermittent rotary movement to a translucent screenrotatively mounted on said casing.

7 In a device of the class described, a cas nghaving a screen rotatablv mounted thereon, a chamber provided in a wall of said casing, and an electromagnetically operated rotating mechanism mounted within said chamber and having the outer surfaces thereof substantially flush with the wall of said caslng.

8. In a device of the class described. alamp casing, a chamber formed in one wall thereof. a bearing shaft secured to the base of said chamber and projecting exteriorly of said casing. ashub rotatably mounted upon said bearing shaft. a color screen surroundmg sald caslngand mounted upon the outer end'of said hub, and means disposed within said chamber for imparting a rotary movement to said color screen about said casing.

9. In a device of the class described, a lamp casing. a chamber formed in one wall thereof, a translucent screen mounted on the chamber for rotative movement about said casing. an electromagnetical- 1y operated armature, disposed within said chamber, a rotary member fixed to said screen and disposed substantially concentrically with respect to said armature, said rotary member having a plurality of engaging surfaces, and meanson said armature foriengaging said engaging surfaces,

10, In a device of the class described, the combination with a lamp casing comprising a chamber formed in one wall thereof, an electromagnet carried and an armature for said electromagnet rotatably mounted with in said chamber, of a translucent screen adapted to be detacha-bly supported on said casing for rotation exteriorly thereof, said screen including means for engagement with said armature whereby a rotary movement is imparted thereto, and means for precluding a movement other than that imparted by said armature.

11. In a device of the class described, a rotating color screen, and a lamp casing disposed within said screen and including as integral elements thereof a chamber adapted to house the moving elements of the actuating mechanism for said screen and clamping means for holding the controllingelement for said actuating mechanism.

light projecting source, a rotatable color screen encircling said light source,sa1d

screen including an annular ring. ateach 12. In a device of the class described, a"

13. In a device of the class described, a

light projecting source, a rotatablecolor the folded edge thereof to permit insertion theret-hrough of a corresponding number of translucent colored slides or plate s 14.11; a device of the class des'cribed. a rotatably mounted color screen, said screen including a pair ofpparallelly disposed annular members. bracing means interconnecting the inner edges ofsald annular members,

and a phu-ality of su porting means for said screen disposed ben ath sald bracing means.

15. In a device ;;of the class described, a rotatably mounted color screen including a.

pair of spaced, annular members, means for permitting insertion of a plurality of translucent slides or plates transversely of said colorscreen, and means threaded between saidannular members for precluding warping of said translucent slides or plates.

In testimony whereof'I hereunto afiix my signature. 1

CHARLES L. KELLERTV. I 

